Do summer chicks need a heat lamp?

Hi we are getting chicks today to go with our lone chick we already have so they are a little less than a week apart. The weather here is upper 90's, next week it will be in the 100's we don't have the lamp on during the day...should we use the heat lamp at night? The brood is in our garage so it stays warm at night.
Thanks!

Newborns need 95 degrees at night for the first week. The temp can be dropped 5 degrees each week. I would give them a heat lamp at night but make sure it doesn't get too hot if the garage is already warm.